MTAC Minotaur works for appendix carry if you adjust it to zero cant. Problem with more cant is the gun sits too low, hindering the draw.
Personally, anything over a 3" bbl is near impossible to appendix carry for me. I only do it when I'm driving then I usually appendix carry my XDSC in the Minotaur with the XDM in a shoulder holster. Since I travel between NC and Fl. pretty frequently, the long ride has me in the habit of never leaving a weapon in the car unless its just too hot for the shoulder holster. Unusual since I can wear it over a t shirt with a loose shirt over the top.
You might also try a leather rig from the holster store dot com. Pretty high quality for the money and you can get it with a slide guard. The length of the bbl is, however, the limiting factor for me on these.